thermostatic switch



Aug@ I Pg M fammi AL THERMQSTATLG svn'fcz I Original Film fmri was A @www if Lw @www im' ff?? `1,505,3170 H. BUCH AL v THERMOSTATIC SWITCH Orignl Filed April 1920 -2 Sheets-5heet @Honnef/.6

,Patented Auml, gdo l 'l piggy.,

esos. e. Aisuozt mi) HOWARD m. estese, os WATERBURY. ooNNEomoUT.

' THERMOSTATIC' SWZETGH.

Application med pril 9051920, Serial No. $75,225. Renewed January 8, 19M.

To all whom it may con/cem: n contacts hereinafter described, two upstand- Be it known that we, PAUL'H; BUoH'and ying posts or yend member` l end 1b, eind;` `'Hoe/Aie) M. Goose, citizens of the United two side posts or members l, v States, and residents of lvVaterbuy,` State ot The post la has an opening or recess to 60 Connecticut, have invented certainnew and receive the boss a, formed on the end plete usejui Improvements in Thermostatic or heed 2 of the expansible motel bellows Switches, ot which tbefollowing is o'. speeil or sylplion 2, which, exceptas hereinafter iioatlon. i y described, may be of the ordinary or :my Uur present invention reletestoiniprovedesired construction. a The timid may be in l0 meets in thermoststic electrieswitches in sorted ite the bellows through en opening -tended for use in apparatus or devices rein heed 2a which is closed by'screw plug 2". `quiriiig tbe control of temperature where The 'head 2* atY the opposite endpwhich is en electric current is used to insure the ese'- the head or member whiehis nioyed by the cution of suoli control. l 'expansion and eontroetionio'ifthe iiuid, is 70 y Oue'object of theinventiou is to provide provided with eboss or, projection, b, which e simple sindi eilicient device in z/,which an tits in an opening in a-forossrhead or yoke, expansible fluid is used as et thermostatio 3, Whiclrlias its op osite ends connected to medium, and meansr are provided'to secure the movementemp fying lever hereinafter f `ready and accurate adjustment. cle-,scribed` endby which kthe 'movement of 75- Another object is to provide e",construc-` the' movable part ofthe bellows is transtion in 'which e simple arrangement 'of' am mittedto effect the movemetof theswitch pliiiyiog moons `is used whereby u smell arm. The cross heed or yoke has its ends movement ot the expiinsible element will slidebl mounted inguides or grooves in result en emplitled movement .of the the si e posts i, these side members haw S0 switob thereby making the apperetus very mg cutaway intermediate portions .to re sensitive. I celve theempliying lever arms which are A 'further object is to provide el construcshown at 6. tion in which the actuel movement of the' Opposed to the bellows isespring 4, which Switch erm o1` member in eitherdirection beers at one end on sin end plete orh'endmem# 3G will be eeoted by ower stored in o spring, ber 4, which hos e, boss or projertion Zr, whereby the switei is moved with e quick fitting in the opening in the yoke, and :it im@ insieme ggtign, the other end against an end pluie or 'hond Stiii another ob'eot is to provide :t cotes 4", which is carried by au adjusting;-` screw struction in which plug contacts disused three-ded through Athe end postk l?. where to avoid sparking, and means are provided by the resistance'othe spring may be ed. toequeiiee the contacts. lustedet will.

'lli/ath these, and othei` objects in, yiew, es The -moyement uuplifying lever 6 is wiil besmette? appear, the intention in ln'eferebly ,of substantially U-shupe, having cludes the. novel t'eeturesof eonstruction the arms of the U extended through slots 9 4@ miderreoggement and combination ol* ports 1d in the bese und piroteily connected hereinafter described, our said invention be their upper ends `to the upper ends of the ying defined by the claims oppeuded hereto. side posts l by the pivot pins or screws o. An cmbodimeutof our invention is illus'- The ends of the yoke n-my conveniently v troted in the accompanyingwdrewings, in be connected to the erm's by pins indicated e5 Whilu-v f at' I, eiguging vertical slots in the lever Figure l, is e, plan View otfth'e, device arms 6. The horizontal portion of the with tbe cover in section', 'frame l has :t boss or projection le, to which Fig. 2 is e section on lineZ-B of Fig. l; is pivoted the doubley armed switch member l Y Fig, 3 is o, Section on line 3-#3 ot Fig, S,v by e pivot 8, preferably in the form 105 5l l, sind f of e screw as shown. i Y Fig. 4 is e detailfview, partly in section, The switch member has u centrally :irillustrutiklig the switch arm and contacts. e ranged V laterally extending; projectionv 8", vRQfery'm by'rgfeI-(mce chmfncgpg to these the end of which is turned down :it an ongle e drawings, t e numeral 1 designates s treme und connected by ai tension spring 9 with u lo w 'o1' beso whichfhus a hollow ,poiftiion 'for couportion of the movement :um (i on the optsinixig or enoosing the switeliA erm ond` posite side of the switch pivot 8%, the horimental portion of the ruote-nient arm heim;r

preferably provided with un singularly lient portion 62 to ilitnte the connection.

Upon e elizin t. inr temperature taking place, the epennon or contraction of' the fluid in .the hellows, which may he ethyl chloride or other suitable agent, censos the movement amplifying lever to he swung in one or they other direction and thus czuise the end of the spring attached to the more :ment lever to lie carried to the opposite eide or" the switch pivot.

Snpposing for example the parts are in the position shown in Fig. il, and the switch in elosed position where it is hohl by the tension of the swing, the contraction olf the fluid in the he lows will swing the movement, simplifying lever (3 to the right until the enci of the spring' attached to they movement sur plifying lever is Carried hy or to the right of the axis ot' the switch. whereupon the tension of the spring will et onoe snap the switch open end hold it in its open position against the stop pin 18. Upon expansion et the finiti in the bellows the reverse action will take piece.

The switch erin is preferably provided, with two mole Contact plugs or terminals l0, which 'are thoroughly insulated from the switch arm hut electrically connected to each other by insulated conductor Wire il.

@n the under side of the horizont-al portion of the treme 1 are located two female Contact plugs l2, which ere arranged to ce not With the mole plugs and which ere slidnbly mounted in and insulated troni the freine i, oy the. housing' i3. These plugs are in electrical enni'iection with terminals it to which the in wires ere connected, und the 'female pluies nucl connection terminals nre prowileii n tiene which a spinge y which tenui to ore the female plugs outwardly to the lin'iits ello-Werl by the housing. This meles the female plugs self-erliustiiig to the mele plugs und compensates or any inequalities due to titting or other causes.

The bellows :intl are protected by e cover 16, provided With pertorfitiims 'for free passage of nii', und the switch is lilie- Wise protected oy e cover plate 17.

From the foregoing; description it is helievecl that the operation und advantages of this impr/nmol thermostetic switch will reeily he apparent, out it. may ne zultled that in this arrangement of iuterioseil amplifying lever with the yoke arms connected with ille 'lever inreletively close proximity to the lever pivots, the movement is so amplified that very slight expansion of the tluizl in the expansihle hellows is sufficient to rictuate the switch member and the device' may therefor'he made extremely sensitive.

Fnrthern'iore, it will he noticed that the expensihle Tfessel and amplifying lever sie refines-:Ll telescoping por' not utilized as s positive or direct means for actuating the switch member, the spring being the direct actuating means. The spring is under tension ut all times, so that it op erstes to keep the switch member in either open or closed position, :unl the thermostutic vessel and anu'ili'fyinc lever are used 4t3 change the position ol the spring, this change in position resulting in tiret applying additional tension to the spring until the dead center is passed. ll/'hen the spring serves to swing the switch member with e quick end 'positive notion.

Furthermore, by this arrangement of switch plugs operating in direct contnet with terminals, sparking is eliminated, which occurs in connection with switches having sliding contacts, 'and furthermore, hy insulating the male contacts from t-he'switeh member end connecting; them' by en insulated'conductor, the passing of the electric current through any of the operating parts o'the instrument is avoided.

Further, in this construction, the plugs of the switch firm ure in direct contact with the terminals in one position, and entirely out of contact in the. other position7 and furthermore the terminals are self-udgusting to the plugs.

Again, the parts of this construction are :ill enclosed and protected and yet are easilv accessible and the device as n whole is reallily assembled and disassembled for cleaning or repairs.

While We have described our improved construction iu considerable detail and illus- 'trateil but a single form thereof in the drawings, it will he readily apparent that various changes and Inoilificalions thereof might 'De mede Without departing from the spirit ot our invention.

Having thus describefl our invention, what we claim iszl. An automatic switch comprising o pitfoted switch member, a. terminal, e substantielly Ushopeil am iliying lever pivotdll supported at the enc s of the rms of the o, tension, springl connected to the switch member o'n one sirio of its pivot and to the amplifying arm on the opposite side of said pivot,V n yoke pivotelly connected with the arms of said lever, and momie for moving said yole. i. v i

il. An automatic `switch comprising e pivoteci switch member, e terminal, a two- :irinofi pivoter] movement amplifying lever, e yoke having its ends connected to said arms, en operating 'device abutting against one sirle ot said yo ie, a spring exerting pressure ou the opposite side of said yoke with means for varying the spring pressure, and means for causing Suid movement amplifying erm to uctuute said switch member.

3.'In combination, a. from having end and side members, automatic operating motore means having an end plate detachebly helci by one of said end members, e substantially U-shaped movement amplifying lever pivnhl carried by t e other post e spring held unk er compression between said spring bearing plates, e terminal, and a coacting switch member and means whereby the movement of the empliyin lever effects actuation of the switchmem er.

il. In en automatic switch e trame or ces ing having e horizontal member and an up- Wordly extending portion, e switch member pivotelly supporteclfrom said horizontal member, e terminal cooperating with seid switch member, n lever having its upper end pivoteti to one of seicll upwardly extending portions and having its lower end positioned adjacent the axis oi' the switch member, e spring connecting the lower end of said lever with the s 'itch member, e liori zontelly movable slide connected to e portion of seid lever intermediate its ends, anni means for moving seid slide.

5, In combina-tion e frame including e horizontal portion end opstanding side posts, e substantially U-sliepeti lever heving its arms passed through slots in seid. horizontal portion and'pivoteii atitheir upper ends to seid posts, e pair of terminals secured to the under side of seid horizontal frame portion, e switch niember pivotecl on a vertical exis to the initier side of seitl horizontal portion and hevxng electrically connected contacts cooperating with seid;

terminals, :in actuating spring' interposed between seid U-sheped lever enel switch lever, and means i'or operating seid U-shapeti lever.

6. In combination e frame including fihorizontal portion and upstending posts, a switch lever pivotally connected to said horizontal portion, terminals with which said switch levercooperntes, e substantially inverted U-slie ed lever srreddling said switch lever' en "having, its arms pivotally connected to seid posts, a spring connecting seid U-slmped lever with. the switch lever, and ineens for swinging said Usheped lever.

74 ln combination, a treme including n horizontal portion and opstanding side and end posts, n' substantially tl-shaped movenient amplifying lever having itsy arms pssecl through slots in said horizontal. portion unil pivoted et their upper ends to said side members, e yoke having its ends pivotiilly connected with saiil rms of the amplifying lever, and actuating means operat ing against one side oi' said yoke, an ad justing spring bearing against the opposite side of said yoke, said vessel and spring being separated from said end members, e. pair of terminals securedv to the under side of said horizontal portion of the freine, n

switch member pivoted on e vertical axis to the under side of the said horizontal portion and having electrically connected contactsv cooperating with said terminals and an actuating spring interposeflL between vseid movement amplifying lever and said switch member.

1n testimony whereof, we niiix our sig-v natures.

PAUL H. BUCH. HGWARD M. GROFF. 

